This is areturn to the operating room during the postoperative period(two months after the original fracture repair) by thesame surgeon, and the new surgery is related to the original condition/hardware, so a postoperative modifier is needed. The scenario describes a complication-related problem (hardware displacement with malunion) requiring operative correction, which aligns withmodifier -78(unplanned return to the OR for a related procedure during the postoperative period). Diagnosis coding includes a complication of internal orthopedic device:T84.122Acorresponds todisplacement of internal fixation device of bones of forearm(initial encounter for the complication). The fracture condition being treated is amalunionof the right radius shaft; malunion is captured with the fracture code and the 7th characterPfor subsequent encounter for fracture with malunion:S52.301P. Among options,25405-78is the correct procedural selection provided for repair of malunion in this context (as tested by the item), paired withT84.122AandS52.301P. Therefore, optionBis correct.